save project

diy2.py

 username = "python"
 userpassword = "123456"
+a=5
 while True:
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        print("登录成功!")
-        break
-    print("用户名和密码错误!请重新输入")
-    if name != username:
-        print("登录不成功!")
-        print("用户名错误")
+    if a>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        a=a-1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        print("用户名和密码错误!请重新输入")
+        if name != username:
+            print("登录不成功!")
+            print("用户名错误")
+            print("友好提示，你还剩"+str(a)+"次机会")
+        else:
+            if password != userpassword:
+                print("登录不成功")
+                print("密码错误")
+                print("友好提示，你还剩"+str(a)+"次机会")
     else:
-       if password != userpassword:
-            print("登录不成功")
-            print("密码错误")
+        print("太棒了，你的账号被锁了")
+        exit()
 print("欢迎来到贝尔编程!")
 
 
+